Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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      28 November 1995, Volume 11 Issue 6 Previous Issue    Next Issue
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    Articles
    Ionomer Toughened Polyolefine
    Xi XU; Xiangshen ZENG; Shaoyun GUO and Huilin LI (Polymer Research Institute and the State Key Laboratory of Polymer Materials Engineering,Chengdu Uuiversity of Science and Technology, Chengdu, 610065, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 391-397. 
    Abstract   HTML   PDF (3128KB)
    The morphology and properties of HDPE blends with Zn-SEPDM and GR were studied through SEM and mechanical property test. The results show that as Zn-SEPDM/GR content amounts to 20%, the blend becomes an IPN in structure, and that a rather high impact and tensile strength of HDPE may be obtained after blending. The antistatic effect, the softening point,and HDT of the blend are higher as compared to HDPE/Zn-SEPDM/ZnSt (zinc stearate).The effect of Zn-SEPDM on the compatibility the morphology and properties of IPP blends were studied by DSC, TEM and mechanical properties test. The results show that as Zn-SEPDM content exceeds 20%. Zn-SEPDM in the blend becomes continuous and an abrupt change in impact strength is incurred there from. Owing to the incorporation of ionic groups into EPDM.the strong interactions betWeen the chains make both the impact and the tensile strength of IPP remarkably higher
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    Microstructure and Mechanical Property of 2024 Aluminium Alloy Prepared by Rapid Solidification and Mechanical Milling
    Guoxian LIANG; Erde WANG; Zhimin LI and Zhichao LI (School of Materials Science and Engineering, Harbin Institute of Technology Harbin, 150001, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 398-402. 
    Abstract   HTML   PDF (1868KB)
    Rapidly solidified 2024 aluminium alloy powders were mechanically milled, then consolidated to bulk form. The microstructural changes of the powders in mechanical milling (MM) and consolidation process were characterized by X-ray diffraction analyses and transmission electron microscopy observations. The results showed that mechanical milling reduced the grain size to nanometer, dissolved the Al2Cu intermetallic compound into the aluminium matrix and produced an aluminium supersaturated solid solution. During consolidation process. the grain size increased to submicrometer, and the Al2Cu and Al2(Cu, Mg, Si, Fe, Mn) compounds precipitated owing to heating. Increasing consolidation temperature and time results in obvious grain growth and coarsening of second phase particles. The tensile yield strength of the consolidated alloy with submicrometer size grains increases with decreasing grain size, and it follows the famous HallPetch relation
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    Effects of Temperature and Disperse Phase of Disordered γ on Strain Hardening Rate of Ni_3Al
    Guangwei HAN; Di FENG and Wujun YE (Central Iron and Steel Research Institute, Beijing, 100081, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 403-408. 
    Abstract   HTML   PDF (1870KB)
    Investigations have been made on the effects of temperature and fine disperse phase of disordered γ on strain hardening rate of Ni3Al based alloy. The result is found that there exists a peak temperature for the strain hardening rate of Ni3Al based alloy below the peak temperature of its yield strength. Analysis shows that the appearance of the peak temperature of strain hardening rate is caused by both the decreasing of the movability of <101> superdislocations on {111}slip plane and the increasing of the dynamic recovery in Ni3Al with increasing temperature. A Ni3Al based alloy hardened by disperse phase of disordered γ has been obtained by controlling chemical composition and treating processes. The peak temperature of strain hardening rate of this alloy is increased due to the fine disperse phase of disordered γ, which causes the reductions of the movability of the superdislocations and the dynamic recovery in Ni3Al
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    Positron Annihilation Study of the Quenched-in Vacancies in CuZnAl Alloys
    Zhongguo WEI and Dazhi YANG (Dept. of Materials Engineering, Dalian University of Technology, Dalian, 116024, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 409-414. 
    Abstract   HTML   PDF (1933KB)
    The excess vacancies in ternary CuZnAl and Ti-doped CuZnAl alloys quenched from temperatures between 673 K and 1223 K, and the behaviour of the quenched-in vacancies on postquench aging in martensite phase have been studied by Doppler broadening measurements. It has been found that adding Ti to the alloys resuIts in the formation of vacancy-Ti solute atom complexes which lowers the mobility of the vacancies. In the Ti-free alloy, the prominent changes in the lineshape S-parameter during the early stage of martensite aging have evidenced the occurrence of vacancy migration to sinks, clustering or vacancy related atomic distortion. The role of the vacancies in martensite stabilization has been discussed
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    Aging Effect on Configuration of Dislocations in Parent Phase of a Thermomechanically Trained Cu-Zn-Al Alloy
    Qingan ZHANG and Jiasheng GAO (East China Institute of Metallurgy, Ma'anshan, 243002, China)Nanju GU and Fuxing YIN (Hebei Institute of Technology Tianjin, 300130, China)(East China Institute of Metallurgy,Ma'anshan, 243002, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 415-417. 
    Abstract   HTML   PDF (2026KB)
    With electron microscopic investigation, the configuration of dislocations in an aged Cu-25,72Zn4.21Al (wt-%) shape memory alloy was found to be in the form of superdislocations and their jogs, which were different from the preferential dislocations regularly aligned in an unaged alloy. These defects generated during aging treatment were considered to be responsible for low fatigue life
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    Crossed Micro-bands in the Martensite Variant Pairs of a Thermomechanically Trained Cu-Zn-Al Alloy
    Qingan ZHANG and Nanju GU (Hebei Institute of Technology Tianjin, 300130, China)(East China Institute of Metallurgy,Ma'anshan, 243002, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 418-420. 
    Abstract   HTML   PDF (1307KB)
    The crossed micro-bands in the martensite variant pairs of a thermomechanically trained Cu25.66Zn-4.02Al (wt-%) alloy have been studied. It was found that the micro-bands pass through the interface from one martensite variant to another and their orientation inside different variants is distinct, which would remain in the parent phase after the reverse transformation and play an important role in the formation of preferential martensite. In fact, the crossed micro-bands are micro-twins for accommodating the stress fields generated during thermomechanically training
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    Effect of Trace Elements P and Si(Mn) on Hydrogen Embrittlement of JBK-75 Alloy
    Anchuan WANG; Yiyi LI; Cungan FAN; Ke YANG; Dongfa LI and Changxu SHI (Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 421-425. 
    Abstract   HTML   PDF (2313KB)
    High purity hot hydrogn charging at high temperature was used to investigate the hydrogen embrittlement (HE) of JBK-75 alloys with different contents of P and Si(Mn). The results indicated that by lowering P content, the size and distribution γ' precipitate became more homogeneous and the precipitation of stable phase η was retarded, thus the hydrogen resistant properties of the alloy wes obviously improved; however, when Si(Mn) content was lowered together with P, though the size and density of γ' were also homogeneous and no η phase was observed, formation of some micro twin around grain boundaries was found to be detrimental to the hydrogen performance of the alloy. and hydrogen induced loss of area reduction was very high. Therefore, to improve the hydrogen resistant properties of the alloy, P content should be lowered while certain amount of Si(Mn) should be kept
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    <100> Textured Diamond Film on Silicon Grown by Hot Filament Chemical Vapor Deposition
    Xuanxiong ZHANG; Tiansheng SHI and Xikang ZHANG (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy,Chinese Academy of Sciences, Shanghai, 200050, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 426-428. 
    Abstract   HTML   PDF (1224KB)
    The <100> textured growth of diamond film on HF eroded silicon wafer has been studied by HFCVD. The evolution of grain size and sudece morphology vs deposition time is presented and the <100> textured thick diamond film (80μm) with smooth surface, desirable for practical application in many fields is obtained
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    Sintering of Doped, Nanocrystalline CeO_2 Powders Prepared under Hydrothermal Conditions
    Yanchun ZHOU(Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)M.N.Rahaman (Ceramic Engineering Department, University of Missouri-Rolla, Rolla, MO 65401, USA)
    J. Mater. Sci. Technol., 1995, 11 (6): 429-434. 
    Abstract   HTML   PDF (2330KB)
    Nanocrystalline CeO2 powders (particle size ≈10-15 nm), doped with up to 20 at.-% of Mg,Ca or Y were prepared by chemical precipitation under hydrothermal conditions. The particle size and shape of the powders change slightly with the dopant concentrations. The the of the dopants on the sintering of the compacted powders was investigated during heating at a constant rate of 10℃/min. The elemental composition and the concentration of the dopant has significant efFect on the densification and grain growth. Compared to undoped CeO2, the dopants produce a shift in the densification curve to higher temperatures. For the same dopant concentration and under identical sintering conditions, the Ca doped samples reach nearly full density with the smallest grain size (≈50 nm), however, the Mg doped sample has the lowest density (≈95% of the theoretical) with the largest grain size (≈1 μm)
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    X-ray Diffraction Line Profile Broadening of Fe_(50)Pd_(50) Alloy Ultrafine Particles
    Jian CHEN; Wenduo WEI; Mingchuan YANG; Xiukui SUN; Wenxiu CHEN and Zhuangqi HU (State Key Lab. of RSA, Institute of Metal Research, Chinese Academy Sciences, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 435-439. 
    Abstract   HTML   PDF (550KB)
    The composition distribution in Fe50Pd50 alloy ultrafine particles prepared by inert gas condensation method was investigated in details by means of X-ray diffraction technique through deconvolution of the X-ray diffraction data. The microscopic composition distribution in the alloy UFP was identified, which is caused by nonuniformity of the melt, fractional distillation during the evaporation process and statistical fluctuation during nucleation and coalescence of the alloy particles. The composition distribution affects the properties of the alloy UFP
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    Transformation Behaviour of Austenite in Steel under Condition of Stress-strain and Its Application
    Xu WANG;Sigen WANG and Lixian HUA (Dept. of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 440-442. 
    Abstract   HTML   PDF (866KB)
    Austenite can be retained at ambient temperature in steels by alloying and processing control. The transformation from austenite to martensite occurs under a certain conditions : thermal or deformation. Stress-strain induced martensitic transformation is important to improve the plasticity of steels which is called transformation induced plasticity (TRIP). Strength-ductility balance of the steels is greatly superior to that of other high strength steels due to the TRIP effect. A new type of steels-TRIP steel is developed
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    Concentration and Temperature Dependence of Electrical Conductivity in Thermally Stable Chromium Polyacrylate
    S. U.Rehman; M.Siddique and Farid A.Khwaja(Materials Research Laboratory, Dept. of Physics, Quaid-i-Azam University, Islamabad, Pakistan)M.S.Zafar(Dept. of Physics, University of the Punjab, Lahore, Pakistan)
    J. Mater. Sci. Technol., 1995, 11 (6): 443-446. 
    Abstract   HTML   PDF (412KB)
    Electrical conductivity of chromium polyacrylate with dopant concentration 30, 40 and 50 wt-% of chromium has been measured over a broad range of temperatures (303 K to 383 K).The electrical conductivity shows dependence on temperature, as well as, level of doping. The conductivity is considered to be due to thermal hopping motion of localized charge carriers,which are believed to be polarons, in the temperature range 303 K to 323 K and for T>343 K,whereas. it is metal-like in the temperature range 323 K to 343 K
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    Corrosion Measurements of Reinforcing Steel by Different Electrochemical Techniques
    S.M.Morsy (Metallurgy Dept. Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt) I.Z.Selim (Physical Chemistry Dept., National Research Center, Dokki, Cairo, Egypt)S. H. Tantawi (Building Research Institute, Dokki, Cairo, Egypt)
    J. Mater. Sci. Technol., 1995, 11 (6): 447-451. 
    Abstract   HTML   PDF (462KB)
    Electrochemical techniques of the corrosion measurements of reinforcing steeI in concrete have been evaluated. These techniques include half-cell potential measurements, impressed voltage method, impressed current method and potentiostatic polarization technique. The results of corrosion behaviour of the steel in both 5%NaCl and 5%MgSO4 show that each electrochemical technique provides some information about the condition of the steel bar or the corrosivity of the environment being evaluated, yet none provides a complete data regarding the corrosion resistance of reinforcing steel in aggressive media
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    Effect of Notches and Environment on Cyclic Life of Alumina
    Fenghui WANG; Minxu LU; Jianfeng WE and Xiulin ZHENG (Northwestern Polytechnical University, Xi'an, 710072, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 452-454. 
    Abstract   HTML   PDF (274KB)
    Four-point bending cyclic fatigue testing has been performed for alumina specimens with two kinds of notch radius in corrosive environments. Cyclic life is found to be dependent on notch radius and environments, the tests also show that the fatigue notch factor Kf is roughly equal to the theoretical notch factor Kt, the fatigue strength and fatigue limit σc are reduced in environment in the sequence: formamide-room air-distilled water
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    Thermal Characteristics of Gel Grown Lanthanum Heptamolybdate crystals
    Sushma Bhat and P.N.Kotru(Dept. of Physics, Uuiversity of Jammu, Jammu -180 001, India) M.L.Koul(Dept. of Chemistry ,Uuiversity of Jammu, Jammu, India)
    J. Mater. Sci. Technol., 1995, 11 (6): 455-459. 
    Abstract   HTML   PDF (540KB)
    Thermal characteristics of Ianthanum heptamolybdate crystals grown by gel technique, employing thermoanalytical techniques, viz. TG, DTA and DSC, are reported. It is established that the rare-earth lanthanum heptamolybdate crystals are associated with thirty water molecules;the composition being La2Mo7O24.3OH2O. It is shown that all the thirty water molecules associated with lanthanum heptamolybdate crystal are lost during its decomposition, leading to its anhydrous form. Results obtained on application of TG based models, viz. Horowitz-Metzger,Coats-Redfern and Piloyan-Novikova and of DSC based methods viz. Roger-Morris-Smith and Barret, regarding solid state reaction kinetics are also reported. The random nucleation model is shown to be the one that is relevant to the decomposition of lanthanum heptamolybdate. The kinetic parameters, viz.the order of reaction. frquency factor, energy of activation and entropy using above mentioned models are computed and shown to bear reasonably good agreement
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    Morphology Characteristics of Nd-rich Phase Particles in Melt-quenched Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd Alloy
    Geping LI; Dong LI; Yuyin LIU and Zhuangqi HU (Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 460-462. 
    Abstract   HTML   PDF (1165KB)
    The morphology of the melt-equenched Ti-5Al-4Sn-2Zr-1Mo-9.25Si-1Nd alloy is uniformly distributed Nd-rich phase particles in matrix. The particles within grains are spherical, and the particles at grain boundaries are elliptical. The Nd-rich phase particle calculated is 6.6 nm in diameter, which is within the 6-15 nm range of average particle diameter experimentally ob served in the alloy The practical interfsce velocity (0.5 m/s) is much greater than the critical velocity (0.15 m/s), hence the Nd-rich phase particles are trapped by the liquid-solid interface
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    Magnetic Properties and Thermal Stability of Pr_(1-x)La_xCo_(5-y)Alloys
    Fazeng LIAN (Dept. of Materials Science and Engineering, Northeastern University, Shenyang, 110006, China)Meiqing HUANG, S.Simizu and W.E.Wallace (Carnegie Mellon Institute, Carnegie Mellon University, Pittsburgh, PA 15213, USA)
    J. Mater. Sci. Technol., 1995, 11 (6): 463-465. 
    Abstract   HTML   PDF (298KB)
    Pr1-xLaxCo5-y (x=0, 0.15. 0.25, 0.35,1.0, y=0.5, 0.7, 0.9, 1.0) alloys were investigated. The effect of the variation of x and y on magnetic properties and thermal stability of the alloys were studied. The magnetic properties for the Pr0.85La0.15Co4.3 and Pr0.75La0.25Co4.1 magnets are iHc=368 kA/m, Br=0.91 T, (BH)max=145.6 kJ/m3, αBr=-0.03%/℃ and iHc=568 kA/m,Br=0.8 T, (BH)max=127.2 kJ/m3,αBr,=-0.06%/℃, respectively The phase structures of as-cast alloys and magnets were investigated
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    Thermodynamic Calculation of Si_3N_4-SiC Phase Equilibrium
    Yali LI and Zhuangqi HU (National Key Lab. of Rapidly Solidified Nonequilibrium Alloys, Institute of Metal Research,CAS, Shenyang, 110015, China)Yang GAO and Yong LIANG (Laser Processing Dept., Institute of Metal Research, CAS, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (6): 466-468. 
    Abstract   HTML   PDF (353KB)
    SisN4 and SiC phase stability via gas phase reactions among SiO, CO/CO2 and N2 has been calculated based on thermochemical equilibrium. The influences of carbon activity (αC), and the partial pressure of SiO (PSiO), CO (PCO) and N2 (PN2) on the Si3N4-SiC stability have been studied and the related phase diagrams have been constructed. Result shows that the lowering αC and PCO/PSiO ratio and the increasing PN2 greatly elevate the Si3N4-SiC equilibrium temperature. Some previously observed experimental results related to Si3N4 and SiC formation at different temperature from the gas phase reactions have been discussed and some guides for sintering and synthesis Of the Si3N4 materials have been proposed
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ISSN: 1005-0302
CN: 21-1315/TG
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